'True Bridge Mode’ vs. 'Pass-Through Mode'
With bridged devices the “Public” IP is announced directly to the customer owned managed Firewall or Router versus a Private IP (10.1.10.X or 192.168.1.X, etc.).
If you want to use ‘true bridge mode’, please note the following characteristics of devices in bridge mode:
- Does not have router capabilities or support LAN DHCP
- Cannot have a fixed Static IP assignment
Comcast Business customers can select devices from the following equipment list that are capable of running in bridge mode: equipment options.
Comcast Business customers can set their existing Comcast Business Wireless Gateways to true bridge mode by:
- Log into the modem
- Disable Private WiFi (2.4GHz and 5GHz) to stop the gateway from broadcasting WiFi Network SSIDs after it is put into True Bridge mode
- Navigate to the Gateway – At a Glance screen in the GUI
- Click Enable to the right of Bridge Mode
- Click OK
**Note**: the Cisco 3939B BWG cannot support WiFi in bridge mode.
Pass-through Mode describes a modem which has its LAN DHCP and Firewall manually disabled through the user interface. This allows traffic to pass-through the modem to a routing device and can be used if the customer has a Static IP address. This is not true Bridge Mode and does not convert the gateway to a basic cable modem. This mode allows most of the routing capabilities of the gateway to remain intact.
Comcast Business customers can put their Comcast Business Wireless Gateway into pass-through mode by:
- Navigate to Gateway > Firewall > IPv4 for Firewall settings
As a best practice for customer with their own firewall, ensure Custom Security is selected and Disable Entire Firewall is checked.
Comcast Business customer with a SMC 8014, SMC D3G, or Netgear CG3000 Comcast Business modem can put their modem into pass-through mode by:
- Navigate to Firewall - Firewall Options for Firewall settings